gecko-dev/gfx/layers/d3d10/ReadbackManagerD3D10.h

107 lines
3.9 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Corporation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Bas Schouten <bschouten@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef GFX_READBACKMANAGERD3D10_H
#define GFX_READBACKMANAGERD3D10_H
#include <windows.h>
#include <d3d10_1.h>
#include "nsTArray.h"
#include "nsAutoPtr.h"
#include "gfxPoint.h"
namespace mozilla {
namespace layers {
DWORD WINAPI StartTaskThread(void *aManager);
struct ReadbackTask;
class ReadbackManagerD3D10 : public IUnknown
{
public:
ReadbackManagerD3D10();
~ReadbackManagerD3D10();
/**
* Tell the readback manager to post a readback task.
*
* @param aTexture D3D10_USAGE_STAGING texture that will contain the data that
* was readback.
* @param aUpdate ReadbackProcessor::Update object. This is a void pointer
* since we cannot forward declare a nested class, and do not
* export ReadbackProcessor.h
* @param aOrigin Origin of the aTexture surface in the ThebesLayer
* coordinate system.
*/
void PostTask(ID3D10Texture2D *aTexture, void *aUpdate, const gfxPoint &aOrigin);
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid,
void **ppvObject);
virtual ULONG STDMETHODCALLTYPE AddRef(void);
virtual ULONG STDMETHODCALLTYPE Release(void);
private:
friend DWORD WINAPI StartTaskThread(void *aManager);
void ProcessTasks();
// The invariant maintained by |mTaskSemaphore| is that the readback thread
// will awaken from WaitForMultipleObjects() at least once per readback
// task enqueued by the main thread. Since the readback thread processes
// exactly one task per wakeup (with one exception), no tasks are lost. The
// exception is when the readback thread is shut down, which orphans the
// remaining tasks, on purpose.
HANDLE mTaskSemaphore;
// Event signaled when the task thread should shutdown
HANDLE mShutdownEvent;
// Handle to the task thread
HANDLE mTaskThread;
// FiFo list of readback tasks that are to be executed. Access is synchronized
// by mTaskMutex.
CRITICAL_SECTION mTaskMutex;
nsTArray<nsAutoPtr<ReadbackTask>> mPendingReadbackTasks;
ULONG mRefCnt;
};
}
}
#endif /* GFX_READBACKMANAGERD3D10_H */